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0 pointsajsharp6y ago0 comments

Wait, what?? There's an invisible DNS server running inside your VPC? I get what you're saying wrt cached DNS lookups but this seems wild.

0 comments

ra1n856y ago

It's a DNS resolver that runs on the hypervisor hosting every instance.

tbrock6y ago

Yes and they limit you to throwing 1024 packets per second per network interface at it.

Of course you could run your own dns cache per host/pod whatever.

cocire6y ago

you've got me so curious, could you please point me to the aws docs?

2 more replies

andreareina6y ago

This allows them to hand out private network addresses (IIRC they use 172.x.x.x) when the DNS query happens from within AWS.

rconti6y ago

"Invisible?" I mean, everyone who builds AWS infra, even just single ec2 instances, is aware of it. It's definitely possible that application engineers aren't aware, though.

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